US Bridges

Is 49 N over US 54 Mna RR

Fair

Vernon County, Missouri · S 3 T 35 N R 31 W · Structure no. 1475

Built
1969
56 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
321 ft
4 main spans
Daily traffic
6,291
2024 count
Owner
State
State Highway Agency

About this bridge

Is 49 N over US 54 Mna RR is a steel continuous stringer/multi-beam or girder carrying Is 49 N over US 54 Mna RR in Vernon County, Missouri. It was built in 1969, so it is 56 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 6,291 vehicles a day, roughly 46% of them trucks, projected to reach 11,009 by 2044. The structure is 321 ft (97.8 m) long and 49 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 49 N
CrossesUS 54 Mna RR
LocationS 3 T 35 N R 31 W
RouteInterstate 49
CountyVernon County
StateMissouri
Coordinates37.8464, -94.33598
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.6 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length321 ft (97.8 m)
Longest span101 ft (30.8 m)
Deck width49 ft (14.9 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,291 (2024)
Projected traffic11,009 by 2044
Trucks46%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 49 N over US 54 Mna RR built?

It was built in 1969, making it 56 years old in 2025.

What condition is Is 49 N over US 54 Mna RR in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2023.

How much traffic does Is 49 N over US 54 Mna RR carry?

About 6,291 vehicles per day (2024 count), of which roughly 46% are trucks.

How long is Is 49 N over US 54 Mna RR?

The structure is 321 ft (97.8 m) long with a longest span of 101 ft (30.8 m) and a deck 49 ft wide.

Who owns Is 49 N over US 54 Mna RR?

It is owned by the State Highway Agency.